Hydraulic jack assemblies are disclosed herein. The hydraulic jack assemblies may include a hydraulic unit base that includes a plurality of pump pistons to output hydraulic fluids with different characteristics that can be selectively used based on load conditions.

Hydraulic jack assemblies are disclosed herein. The hydraulic jack assemblies may include a hydraulic unit base that includes a plurality of pump pistons to output hydraulic fluids with different characteristics that can be selectively used based on load conditions.

A cylinder assembly having a housing, a pump supported within the housing, a motor supported within the housing and operable to power the pump, and a power source supported by the housing and operable to supply power to the motor. A cylinder has a first end, an opposite second end, and a sidewall extending therebetween. A piston is movably supported by the cylinder, the pump being operable to supply hydraulic fluid to the cylinder to move the piston relative to the cylinder at least from a retracted position to an advanced position. A frame is coupled to the sidewall of the cylinder and supporting the pump and the motor.

A cylinder assembly having a housing, a pump supported within the housing, a motor supported within the housing and operable to power the pump, and a power source supported by the housing and operable to supply power to the motor. A cylinder has a first end, an opposite second end, and a sidewall extending therebetween. A piston is movably supported by the cylinder, the pump being operable to supply hydraulic fluid to the cylinder to move the piston relative to the cylinder at least from a retracted position to an advanced position. A frame is coupled to the sidewall of the cylinder and supporting the pump and the motor.

The safety jack includes a base and a piston jack mounted on the base. The piston jack includes a base tube mounted on the base. A threaded rod within the base tube has a portion extending above the base tube, where the threaded rod is free to move up and down within the base tube. A nut on the portion of the threaded rod extends above base tube, and a jack saddle is connected to a top of the piston and a top of the threaded base. The nut can be screwed down onto a top of the base tube so as to prevent the jack saddle from being lowered.

The safety jack includes a base and a piston jack mounted on the base. The piston jack includes a base tube mounted on the base. A threaded rod within the base tube has a portion extending above the base tube, where the threaded rod is free to move up and down within the base tube. A nut on the portion of the threaded rod extends above base tube, and a jack saddle is connected to a top of the piston and a top of the threaded base. The nut can be screwed down onto a top of the base tube so as to prevent the jack saddle from being lowered.

Provided is an improved oil release mechanism for a lightweight jack, which is matched with an oil pump body. The pump body is equipped with a valve chamber, an moving chamber, an oil storage chamber, and an oil return passage. The valve chamber is located in the middle of the oil return passage and is connected to the oil storage chamber and the moving chamber at both ends. The main body of the oil pump is hinged with a pump lever, which includes a drain valve located in the valve chamber and having a driving part, a rotation shaft located in the pump lever chamber and positioned for rotation, and a transmission component for transmitting the power of the rotation shaft to drive the opening and closing of the drain valve. The present disclosure can effectively simplify the operation process and conveniently achieve pressure relief operation.

Provided is an improved oil release mechanism for a lightweight jack, which is matched with an oil pump body. The pump body is equipped with a valve chamber, an moving chamber, an oil storage chamber, and an oil return passage. The valve chamber is located in the middle of the oil return passage and is connected to the oil storage chamber and the moving chamber at both ends. The main body of the oil pump is hinged with a pump lever, which includes a drain valve located in the valve chamber and having a driving part, a rotation shaft located in the pump lever chamber and positioned for rotation, and a transmission component for transmitting the power of the rotation shaft to drive the opening and closing of the drain valve. The present disclosure can effectively simplify the operation process and conveniently achieve pressure relief operation.